package com.mcr.reggie.filter;

import com.alibaba.fastjson.JSON;
import com.mcr.reggie.common.R;
import com.mcr.reggie.utils.BaseContext;
import lombok.extern.slf4j.Slf4j;
import org.springframework.util.AntPathMatcher;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
@Slf4j
@WebFilter(filterName = "LoginFilter",urlPatterns = "/*")
public class LoginCheckFilter implements Filter {
    //路径匹配器(支持通配符)
    public static final AntPathMatcher PATH_MATCHER=new AntPathMatcher();
    /**
     *路径匹配方法
     */
    public boolean chack(String requesturi,String[] uris){
        for (String uri:uris){
            boolean match = PATH_MATCHER.match(uri, requesturi);//匹配返回true,否则false
            if(match){
                return true;
            }
        }
        return false;
    }
    @Override
    public void doFilter(ServletRequest servletRequest,
                         ServletResponse servletResponse,
                         FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest request= (HttpServletRequest) servletRequest;
        HttpServletResponse response= (HttpServletResponse) servletResponse;
        //1、获取本次请求的URI
        String uri = request.getRequestURI();
        //定义不需要处理的请求路径
        String[] uris=new String[]{
                "/employee/login",
                "/employee/logout",
                "/front/**",
                "/backend/**",
                "/user/sendMsg",//移动端发送验证码
                "/user/login",//移动端登陆
                "/doc.html",
                "/webjars/**",
                "/swagger-resources",
                "/v2/api-docs"
        };
        //2、判断本次请求是否需要处理
        //3、如果不需要处理，则直接放行
        if(chack(uri,uris)){
            filterChain.doFilter(request,response);
            return;
        }
        //4、判断登录状态，如果已登录，则直接放行
        int i=0;
        if (request.getSession().getAttribute("emp")!=null){//后台管理系统
            BaseContext.setEmpCurrentId((Long) request.getSession().getAttribute("emp"));
            i++;
        }
        if (request.getSession().getAttribute("user")!=null){//前台用户
            BaseContext.setUserCurrentId((Long) request.getSession().getAttribute("user"));
            i++;
        }
        if(i!=0){
            filterChain.doFilter(request,response);
            return;
        }
        //5、如果未登录则返回未登录结果，通过输出流方式向客户端页面响应数据
        response.getWriter().write(JSON.toJSONString(R.error("NOTLOGIN")));
        return;
    }
}
